籽晶法定向凝固TiAl基合金片层取向控制

doi:10.11900/0412.1961.2017.00516

金属学报

2018, Vol. 54

Issue (5): 647-656 DOI: 10.11900/0412.1961.2017.00516

金属材料的凝固专刊

本期目录 | 过刊浏览

籽晶法定向凝固TiAl基合金片层取向控制

苏彦庆(

), 刘桐, 李新中, 陈瑞润, 郭景杰, 傅恒志

哈尔滨工业大学金属精密热加工国家级重点实验室哈尔滨 150001

The Evolution of Seeding Technique for the Lamellar Orientation Controlling of γ-TiAl Based Alloys

Yanqing SU(

), Tong LIU, Xinzhong LI, Ruirun CHEN, Jingjie GUO, Hengzhi FU

National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China

引用本文:

苏彦庆, 刘桐, 李新中, 陈瑞润, 郭景杰, 傅恒志. 籽晶法定向凝固TiAl基合金片层取向控制[J]. 金属学报, 2018, 54(5): 647-656.
Yanqing SU, Tong LIU, Xinzhong LI, Ruirun CHEN, Jingjie GUO, Hengzhi FU. The Evolution of Seeding Technique for the Lamellar Orientation Controlling of γ-TiAl Based Alloys[J]. Acta Metall Sin, 2018, 54(5): 647-656.

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摘要:

TiAl基合金是一种在航空航天等领域极具应用前景的轻质高温结构材料,通过控制TiAl基合金中片层取向可显著提升合金在单向受力条件下的综合力学性能。本文介绍了籽晶法定向凝固技术在TiAl基合金片层取向控制的最新进展,回顾了传统Ti-43Al-3Si籽晶法所面临的问题,重点总结了近年来新发展的二次定向凝固法、原位自籽晶定向凝固法、准籽晶定向凝固技术以及高熔点金属籽晶定向凝固技术,这些技术有利于促进籽晶法定向凝固控制TiAl基合金片层取向的工程化进展。但TiAl基合金中不同相的实际生长取向的持续稳定需要籽晶引晶与动力学条件的相结合才能得以实现,因此,新型籽晶技术与定向凝固工艺条件的互相结合将是未来籽晶法的发展趋势。

关键词 ： TiAl基合金, 定向凝固, 籽晶法, 片层取向控制

Abstract：

TiAl-based alloys will be potentially used as light-weight high temperature structural materials in aerospace industry. The comprehensive mechanical properties of TiAl-based alloys can be improved significantly when lamellar orientation is aligned parallel to principle stress. In this paper, the development of seeding technique in directionally solidified TiAl-based alloys is reviewed, including the traditional Ti-43Al-3Si seeding method and some novel seeding methods. Those methods mainly include the second directional solidification method, self-seeding technique, quasi-seeding technique and high-melting metal seeding technique. Those newly developed methods will promote the engineering applications of the lamellar structure controlling technology for TiAl-based alloys. However, the stable growth of different leading phase in its designed direction depends on the coupling of the seed and growth dynamic parameteres. How to discover the influence of the growth dynamic parameteres on the designed growth direction is a key problem.

Key words： TiAl-based alloy directional solidification seeding technique lamellar orientation controlling

收稿日期: 2017-12-04

ZTFLH:

TG146.23

基金资助:资助项目国家自然科学基金项目Nos.51425402和51331005,国家重点研发计划项目No.2017YFA0403804及长江学者奖励计划项目No.T2014227

作者简介:

作者简介苏彦庆,男,1969年生,教授,博士

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	苏彦庆
	刘桐
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	郭景杰
	傅恒志
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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00516 或 https://www.ams.org.cn/CN/Y2018/V54/I5/647

图1 采用电磁约束定向凝固技术,以Ti-43Al-3Si为籽晶定向Ti-47Al二元合金宏观组织[17]

图2 生长速率为36 mm/h时不同凝固阶段Ti-47Al试样的纵截面组织[20]

图3 Ti-43Al-3Si合金经不同时间热稳定化处理后糊状区纵向宏观组织[22]

图4 以Ti-43Al-3Si合金为籽晶定向凝固Ti-47Al-1.0W-0.5Si合金不同高度的纵截面微观组织[22]

图5 二次定向凝固Ti-46Al-5Nb合金宏观组织图[26]

图6 Ti-46Al-5Nb合金二次定向凝固过程初始生长模式图[26]

图7 冷坩埚原位籽晶定向凝固示意图[29]

图8 采用水冷铜坩埚制备的试样纵剖面宏观组织[30]

图9 自籽晶法定向凝固过程示意图[31]

图10 准籽晶法定向凝固Ti-48Al-2Cr-2Nb合金过程中不同凝固区域内微观组织[17]

图11 Ti-Al二元相图和快速加热过程中的组织演化示意图[17]

图12 以Ti为籽晶定向凝固Ti-47Al-0.5W-0.5Si合金铸锭及成分过渡界面[40]

图13 以Ti为籽晶定向凝固Ti-47Al-0.5W-0.5Si合金微观组织演化示意图[40]

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